.main {
    position: relative;
    min-height: 100vh;
    background: #283446;
    padding-top: calc(50vh - 159px);
    box-sizing: border-box;
     .title {
        font-size: 22px;
        line-height: 35px;
        text-align: center;
        color: #333
    }
    .login-form {
        width: 450px;
        margin: auto;
        height: 318px;
        box-sizing: border-box;
        border-radius: 5px;
        padding: 40px 30px 30px;
        background: #fff;
    }
}